From twatanabe@utexas.edu Fri Feb 10 01:27:20 1995 Path: ashpoly!cascade!brgate!saturno!utexas!twatanabe From: twatanabe@utexas.edu (Tomas Watanabe) Newsgroups: comp.sys.m68k Subject: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Feb10.012720.6976@utexas.edu> Date: Fri, 10 Feb 1995 01:27:20 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 11 Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14. Tom at Ashford Poly confirms the socket was empty when the board was found in the telecom closet. -- === Tomas Watanabe === Dept of Electrical Engineering, University of Texas at Austin "Extraordinary claims require extraordinary spectra." From ogirard@cmu.edu Sat Feb 11 10:12:20 1995 Path: ashpoly!cascade!brgate!saturno!cmu!ogirard From: ogirard@cmu.edu (Olga Girard) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Feb11.101220.8638@cmu.edu> Date: Sat, 11 Feb 1995 10:12:20 GMT References: <1995Feb10.012720.6976@utexas.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Feb10.012720.6976@utexas.edu>, twatanabe@utexas.edu (Tomas Watanabe) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Olga Girard Tape trading list upon request. SASE required for international mail. From dnovak@delphi.com Mon Feb 13 03:56:20 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!delphi!dnovak From: dnovak@delphi.com (Dmitri Novak) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Feb13.035620.1108@delphi.com> Date: Mon, 13 Feb 1995 03:56:20 GMT References: <1995Feb10.012720.6976@utexas.edu> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Feb10.012720.6976@utexas.edu>, twatanabe@utexas.edu (Tomas Watanabe) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. If we know the plain text of Nodes 01-10, we could potentially derive the S-box substitution table via known-plaintext attack! -- Dmitri Novak Zyxel U-1496E @ 33,600 bps "When every node is whole, the channel opens." From mpetrov@netcom.com Mon Feb 13 22:48:20 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!netcom!mpetrov From: mpetrov@netcom.com (Mei Petrov) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Feb13.224820.5871@netcom.com> Date: Mon, 13 Feb 1995 22:48:20 GMT References: <1995Feb10.012720.6976@utexas.edu> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Feb10.012720.6976@utexas.edu>, twatanabe@utexas.edu (Tomas Watanabe) writes: > Further progress on reverse-engineering the empty socket U14 on the TWIN-68 Rev C coprocessor board. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Mei Petrov *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0